src/audio/SDL_audio.c
author Ryan C. Gordon
Thu, 11 Jul 2013 23:59:09 -0400
changeset 7407 db8a19d767d7
parent 7406 fb02213c11d3
child 7446 6cbb6aaedc20
permissions -rw-r--r--
Whoops, missed a part of that last commit.

Actually fixes Bugzilla #1857.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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/* Allow access to a raw mixing buffer */
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#include "SDL.h"
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#include "SDL_audio.h"
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#include "SDL_audio_c.h"
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#include "SDL_audiomem.h"
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#include "SDL_sysaudio.h"
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#define _THIS SDL_AudioDevice *_this
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static SDL_AudioDriver current_audio;
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static SDL_AudioDevice *open_devices[16];
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/* !!! FIXME: These are wordy and unlocalized... */
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#define DEFAULT_OUTPUT_DEVNAME "System audio output device"
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#define DEFAULT_INPUT_DEVNAME "System audio capture device"
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/*
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 * Not all of these will be compiled and linked in, but it's convenient
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 *  to have a complete list here and saves yet-another block of #ifdefs...
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 *  Please see bootstrap[], below, for the actual #ifdef mess.
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 */
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extern AudioBootStrap BSD_AUDIO_bootstrap;
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extern AudioBootStrap DSP_bootstrap;
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extern AudioBootStrap ALSA_bootstrap;
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extern AudioBootStrap PULSEAUDIO_bootstrap;
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extern AudioBootStrap QSAAUDIO_bootstrap;
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extern AudioBootStrap SUNAUDIO_bootstrap;
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extern AudioBootStrap ARTS_bootstrap;
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extern AudioBootStrap ESD_bootstrap;
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extern AudioBootStrap NAS_bootstrap;
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extern AudioBootStrap XAUDIO2_bootstrap;
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extern AudioBootStrap DSOUND_bootstrap;
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extern AudioBootStrap WINMM_bootstrap;
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extern AudioBootStrap PAUDIO_bootstrap;
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extern AudioBootStrap BEOSAUDIO_bootstrap;
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extern AudioBootStrap COREAUDIO_bootstrap;
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extern AudioBootStrap SNDMGR_bootstrap;
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extern AudioBootStrap DISKAUD_bootstrap;
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extern AudioBootStrap DUMMYAUD_bootstrap;
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extern AudioBootStrap DCAUD_bootstrap;
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extern AudioBootStrap DART_bootstrap;
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extern AudioBootStrap NDSAUD_bootstrap;
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extern AudioBootStrap FUSIONSOUND_bootstrap;
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extern AudioBootStrap ANDROIDAUD_bootstrap;
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extern AudioBootStrap PSPAUD_bootstrap;
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extern AudioBootStrap SNDIO_bootstrap;
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/* Available audio drivers */
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static const AudioBootStrap *const bootstrap[] = {
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#if SDL_AUDIO_DRIVER_PULSEAUDIO
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    &PULSEAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ALSA
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    &ALSA_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SNDIO
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    &SNDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BSD
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    &BSD_AUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_OSS
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    &DSP_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_QSA
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    &QSAAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SUNAUDIO
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    &SUNAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ARTS
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    &ARTS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ESD
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    &ESD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NAS
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    &NAS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_XAUDIO2
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    &XAUDIO2_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DSOUND
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    &DSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_WINMM
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    &WINMM_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PAUDIO
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    &PAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BEOSAUDIO
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    &BEOSAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_COREAUDIO
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    &COREAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DISK
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    &DISKAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DUMMY
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    &DUMMYAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_FUSIONSOUND
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    &FUSIONSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ANDROID
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    &ANDROIDAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PSP
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    &PSPAUD_bootstrap,
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#endif
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    NULL
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};
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static SDL_AudioDevice *
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get_audio_device(SDL_AudioDeviceID id)
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{
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    id--;
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    if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
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        SDL_SetError("Invalid audio device ID");
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        return NULL;
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    }
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    return open_devices[id];
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}
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/* stubs for audio drivers that don't need a specific entry point... */
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static void
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SDL_AudioDetectDevices_Default(int iscapture, SDL_AddAudioDevice addfn)
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{                               /* no-op. */
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}
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static void
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SDL_AudioThreadInit_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioWaitDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioPlayDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static Uint8 *
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SDL_AudioGetDeviceBuf_Default(_THIS)
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{
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    return NULL;
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}
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static void
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SDL_AudioWaitDone_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioCloseDevice_Default(_THIS)
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{                               /* no-op. */
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}
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static void
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SDL_AudioDeinitialize_Default(void)
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{                               /* no-op. */
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}
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static int
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SDL_AudioOpenDevice_Default(_THIS, const char *devname, int iscapture)
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{
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    return -1;
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}
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static void
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SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
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{
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return;
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    }
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    SDL_LockMutex(device->mixer_lock);
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}
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static void
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SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
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{
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    if (device->thread && (SDL_ThreadID() == device->threadid)) {
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        return;
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    }
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    SDL_UnlockMutex(device->mixer_lock);
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}
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static void
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finalize_audio_entry_points(void)
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{
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    /*
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     * Fill in stub functions for unused driver entry points. This lets us
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     *  blindly call them without having to check for validity first.
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     */
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#define FILL_STUB(x) \
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        if (current_audio.impl.x == NULL) { \
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            current_audio.impl.x = SDL_Audio##x##_Default; \
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        }
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    FILL_STUB(DetectDevices);
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    FILL_STUB(OpenDevice);
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    FILL_STUB(ThreadInit);
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    FILL_STUB(WaitDevice);
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    FILL_STUB(PlayDevice);
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    FILL_STUB(GetDeviceBuf);
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    FILL_STUB(WaitDone);
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    FILL_STUB(CloseDevice);
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    FILL_STUB(LockDevice);
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    FILL_STUB(UnlockDevice);
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    FILL_STUB(Deinitialize);
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#undef FILL_STUB
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}
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/* Streaming functions (for when the input and output buffer sizes are different) */
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/* Write [length] bytes from buf into the streamer */
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static void
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SDL_StreamWrite(SDL_AudioStreamer * stream, Uint8 * buf, int length)
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{
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    int i;
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    for (i = 0; i < length; ++i) {
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        stream->buffer[stream->write_pos] = buf[i];
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        ++stream->write_pos;
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    }
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}
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/* Read [length] bytes out of the streamer into buf */
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static void
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SDL_StreamRead(SDL_AudioStreamer * stream, Uint8 * buf, int length)
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{
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    int i;
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    for (i = 0; i < length; ++i) {
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        buf[i] = stream->buffer[stream->read_pos];
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        ++stream->read_pos;
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    }
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}
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static int
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SDL_StreamLength(SDL_AudioStreamer * stream)
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{
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    return (stream->write_pos - stream->read_pos) % stream->max_len;
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}
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/* Initialize the stream by allocating the buffer and setting the read/write heads to the beginning */
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#if 0
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static int
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SDL_StreamInit(SDL_AudioStreamer * stream, int max_len, Uint8 silence)
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{
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    /* First try to allocate the buffer */
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    stream->buffer = (Uint8 *) SDL_malloc(max_len);
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    if (stream->buffer == NULL) {
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        return -1;
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    }
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    stream->max_len = max_len;
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    stream->read_pos = 0;
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    stream->write_pos = 0;
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    /* Zero out the buffer */
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    SDL_memset(stream->buffer, silence, max_len);
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    return 0;
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}
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#endif
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/* Deinitialize the stream simply by freeing the buffer */
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static void
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SDL_StreamDeinit(SDL_AudioStreamer * stream)
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{
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    if (stream->buffer != NULL) {
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        SDL_free(stream->buffer);
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    }
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}
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#if defined(ANDROID)
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#include <android/log.h>
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#endif
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/* The general mixing thread function */
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int SDLCALL
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SDL_RunAudio(void *devicep)
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{
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    SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
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    Uint8 *stream;
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    int stream_len;
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    void *udata;
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    void (SDLCALL * fill) (void *userdata, Uint8 * stream, int len);
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    Uint32 delay;
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    /* For streaming when the buffer sizes don't match up */
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    Uint8 *istream;
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    int istream_len = 0;
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    /* The audio mixing is always a high priority thread */
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    SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
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    /* Perform any thread setup */
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    device->threadid = SDL_ThreadID();
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    current_audio.impl.ThreadInit(device);
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    /* Set up the mixing function */
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    fill = device->spec.callback;
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    udata = device->spec.userdata;
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    /* By default do not stream */
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    device->use_streamer = 0;
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    if (device->convert.needed) {
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#if 0                           /* !!! FIXME: I took len_div out of the structure. Use rate_incr instead? */
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        /* If the result of the conversion alters the length, i.e. resampling is being used, use the streamer */
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        if (device->convert.len_mult != 1 || device->convert.len_div != 1) {
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            /* The streamer's maximum length should be twice whichever is larger: spec.size or len_cvt */
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            stream_max_len = 2 * device->spec.size;
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            if (device->convert.len_mult > device->convert.len_div) {
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                stream_max_len *= device->convert.len_mult;
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                stream_max_len /= device->convert.len_div;
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            }
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            if (SDL_StreamInit(&device->streamer, stream_max_len, silence) <
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                0)
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                return -1;
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            device->use_streamer = 1;
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            /* istream_len should be the length of what we grab from the callback and feed to conversion,
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               so that we get close to spec_size. I.e. we want device.spec_size = istream_len * u / d
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             */
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            istream_len =
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                device->spec.size * device->convert.len_div /
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                device->convert.len_mult;
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        }
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#endif
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        /* stream_len = device->convert.len; */
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        stream_len = device->spec.size;
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    } else {
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        stream_len = device->spec.size;
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    }
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    /* Calculate the delay while paused */
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    delay = ((device->spec.samples * 1000) / device->spec.freq);
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    /* Determine if the streamer is necessary here */
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    if (device->use_streamer == 1) {
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        /* This code is almost the same as the old code. The difference is, instead of reading
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           directly from the callback into "stream", then converting and sending the audio off,
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           we go: callback -> "istream" -> (conversion) -> streamer -> stream -> device.
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           However, reading and writing with streamer are done separately:
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           - We only call the callback and write to the streamer when the streamer does not
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           contain enough samples to output to the device.
slouken@2716
   381
           - We only read from the streamer and tell the device to play when the streamer
slouken@2716
   382
           does have enough samples to output.
slouken@2716
   383
           This allows us to perform resampling in the conversion step, where the output of the
slouken@2716
   384
           resampling process can be any number. We will have to see what a good size for the
slouken@2716
   385
           stream's maximum length is, but I suspect 2*max(len_cvt, stream_len) is a good figure.
slouken@2716
   386
         */
slouken@2716
   387
        while (device->enabled) {
slouken@3336
   388
slouken@3336
   389
            if (device->paused) {
slouken@3336
   390
                SDL_Delay(delay);
slouken@3336
   391
                continue;
slouken@3336
   392
            }
slouken@3336
   393
slouken@2716
   394
            /* Only read in audio if the streamer doesn't have enough already (if it does not have enough samples to output) */
slouken@2716
   395
            if (SDL_StreamLength(&device->streamer) < stream_len) {
slouken@2716
   396
                /* Set up istream */
slouken@2716
   397
                if (device->convert.needed) {
slouken@2716
   398
                    if (device->convert.buf) {
slouken@2716
   399
                        istream = device->convert.buf;
slouken@2716
   400
                    } else {
slouken@2716
   401
                        continue;
slouken@2716
   402
                    }
slouken@2716
   403
                } else {
slouken@3336
   404
/* FIXME: Ryan, this is probably wrong.  I imagine we don't want to get
slouken@3336
   405
 * a device buffer both here and below in the stream output.
slouken@3336
   406
 */
slouken@2716
   407
                    istream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   408
                    if (istream == NULL) {
slouken@2716
   409
                        istream = device->fake_stream;
slouken@2716
   410
                    }
slouken@2716
   411
                }
slouken@0
   412
slouken@2716
   413
                /* Read from the callback into the _input_ stream */
slouken@6977
   414
                SDL_LockMutex(device->mixer_lock);
slouken@3336
   415
                (*fill) (udata, istream, istream_len);
slouken@6977
   416
                SDL_UnlockMutex(device->mixer_lock);
slouken@2716
   417
slouken@2716
   418
                /* Convert the audio if necessary and write to the streamer */
slouken@2716
   419
                if (device->convert.needed) {
slouken@2716
   420
                    SDL_ConvertAudio(&device->convert);
slouken@2716
   421
                    if (istream == NULL) {
slouken@2716
   422
                        istream = device->fake_stream;
slouken@2716
   423
                    }
slouken@2716
   424
                    /*SDL_memcpy(istream, device->convert.buf, device->convert.len_cvt); */
slouken@2716
   425
                    SDL_StreamWrite(&device->streamer, device->convert.buf,
slouken@2716
   426
                                    device->convert.len_cvt);
slouken@2716
   427
                } else {
slouken@2716
   428
                    SDL_StreamWrite(&device->streamer, istream, istream_len);
slouken@2716
   429
                }
slouken@1895
   430
            }
slouken@2716
   431
slouken@2716
   432
            /* Only output audio if the streamer has enough to output */
slouken@2716
   433
            if (SDL_StreamLength(&device->streamer) >= stream_len) {
slouken@2716
   434
                /* Set up the output stream */
slouken@2716
   435
                if (device->convert.needed) {
slouken@2716
   436
                    if (device->convert.buf) {
slouken@2716
   437
                        stream = device->convert.buf;
slouken@2716
   438
                    } else {
slouken@2716
   439
                        continue;
slouken@2716
   440
                    }
slouken@2716
   441
                } else {
slouken@2716
   442
                    stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   443
                    if (stream == NULL) {
slouken@2716
   444
                        stream = device->fake_stream;
slouken@2716
   445
                    }
slouken@2716
   446
                }
slouken@2716
   447
slouken@2716
   448
                /* Now read from the streamer */
slouken@2716
   449
                SDL_StreamRead(&device->streamer, stream, stream_len);
slouken@2716
   450
slouken@2716
   451
                /* Ready current buffer for play and change current buffer */
slouken@3336
   452
                if (stream != device->fake_stream) {
slouken@2716
   453
                    current_audio.impl.PlayDevice(device);
slouken@3096
   454
                    /* Wait for an audio buffer to become available */
slouken@3096
   455
                    current_audio.impl.WaitDevice(device);
slouken@2716
   456
                } else {
slouken@3336
   457
                    SDL_Delay(delay);
slouken@2716
   458
                }
slouken@1895
   459
            }
slouken@0
   460
slouken@1895
   461
        }
slouken@2716
   462
    } else {
slouken@2716
   463
        /* Otherwise, do not use the streamer. This is the old code. */
icculus@7406
   464
        const int silence = (int) device->spec.silence;
slouken@0
   465
slouken@2716
   466
        /* Loop, filling the audio buffers */
slouken@2716
   467
        while (device->enabled) {
slouken@2716
   468
slouken@2716
   469
            /* Fill the current buffer with sound */
slouken@2716
   470
            if (device->convert.needed) {
slouken@2716
   471
                if (device->convert.buf) {
slouken@2716
   472
                    stream = device->convert.buf;
slouken@2716
   473
                } else {
slouken@2716
   474
                    continue;
slouken@2716
   475
                }
slouken@2716
   476
            } else {
slouken@2716
   477
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   478
                if (stream == NULL) {
slouken@2716
   479
                    stream = device->fake_stream;
slouken@2716
   480
                }
slouken@1895
   481
            }
slouken@0
   482
icculus@7406
   483
            if (device->paused) {
icculus@7406
   484
                SDL_memset(stream, silence, stream_len);
icculus@7406
   485
            } else {
icculus@7406
   486
                SDL_LockMutex(device->mixer_lock);
icculus@7406
   487
                (*fill) (udata, stream, stream_len);
icculus@7406
   488
                SDL_UnlockMutex(device->mixer_lock);
icculus@7406
   489
            }
slouken@1562
   490
slouken@2716
   491
            /* Convert the audio if necessary */
slouken@2716
   492
            if (device->convert.needed) {
slouken@2716
   493
                SDL_ConvertAudio(&device->convert);
slouken@2716
   494
                stream = current_audio.impl.GetDeviceBuf(device);
slouken@2716
   495
                if (stream == NULL) {
slouken@2716
   496
                    stream = device->fake_stream;
slouken@2716
   497
                }
slouken@2716
   498
                SDL_memcpy(stream, device->convert.buf,
slouken@2716
   499
                           device->convert.len_cvt);
slouken@2716
   500
            }
slouken@2716
   501
slouken@2716
   502
            /* Ready current buffer for play and change current buffer */
slouken@3336
   503
            if (stream != device->fake_stream) {
slouken@2716
   504
                current_audio.impl.PlayDevice(device);
slouken@3096
   505
                /* Wait for an audio buffer to become available */
slouken@3096
   506
                current_audio.impl.WaitDevice(device);
slouken@2716
   507
            } else {
slouken@3336
   508
                SDL_Delay(delay);
slouken@2716
   509
            }
slouken@1895
   510
        }
slouken@1895
   511
    }
slouken@1562
   512
slouken@1895
   513
    /* Wait for the audio to drain.. */
icculus@2049
   514
    current_audio.impl.WaitDone(device);
slouken@21
   515
slouken@2716
   516
    /* If necessary, deinit the streamer */
slouken@2716
   517
    if (device->use_streamer == 1)
slouken@2716
   518
        SDL_StreamDeinit(&device->streamer);
slouken@2716
   519
slouken@1895
   520
    return (0);
slouken@0
   521
}
slouken@0
   522
slouken@322
   523
icculus@1982
   524
static SDL_AudioFormat
slouken@1895
   525
SDL_ParseAudioFormat(const char *string)
slouken@1794
   526
{
icculus@2076
   527
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
icculus@2049
   528
    CHECK_FMT_STRING(U8);
icculus@2049
   529
    CHECK_FMT_STRING(S8);
icculus@2049
   530
    CHECK_FMT_STRING(U16LSB);
icculus@2049
   531
    CHECK_FMT_STRING(S16LSB);
icculus@2049
   532
    CHECK_FMT_STRING(U16MSB);
icculus@2049
   533
    CHECK_FMT_STRING(S16MSB);
icculus@2049
   534
    CHECK_FMT_STRING(U16SYS);
icculus@2049
   535
    CHECK_FMT_STRING(S16SYS);
icculus@2049
   536
    CHECK_FMT_STRING(U16);
icculus@2049
   537
    CHECK_FMT_STRING(S16);
icculus@2049
   538
    CHECK_FMT_STRING(S32LSB);
icculus@2049
   539
    CHECK_FMT_STRING(S32MSB);
icculus@2049
   540
    CHECK_FMT_STRING(S32SYS);
icculus@2049
   541
    CHECK_FMT_STRING(S32);
icculus@2049
   542
    CHECK_FMT_STRING(F32LSB);
icculus@2049
   543
    CHECK_FMT_STRING(F32MSB);
icculus@2049
   544
    CHECK_FMT_STRING(F32SYS);
icculus@2049
   545
    CHECK_FMT_STRING(F32);
slouken@2060
   546
#undef CHECK_FMT_STRING
icculus@2049
   547
    return 0;
slouken@1895
   548
}
slouken@1895
   549
slouken@1895
   550
int
slouken@1895
   551
SDL_GetNumAudioDrivers(void)
slouken@1895
   552
{
slouken@1895
   553
    return (SDL_arraysize(bootstrap) - 1);
slouken@1895
   554
}
slouken@1895
   555
slouken@1895
   556
const char *
slouken@1895
   557
SDL_GetAudioDriver(int index)
slouken@1895
   558
{
slouken@1895
   559
    if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
slouken@1895
   560
        return (bootstrap[index]->name);
slouken@1895
   561
    }
slouken@1895
   562
    return (NULL);
slouken@1794
   563
}
slouken@1794
   564
slouken@1895
   565
int
slouken@1895
   566
SDL_AudioInit(const char *driver_name)
slouken@0
   567
{
icculus@2049
   568
    int i = 0;
icculus@2049
   569
    int initialized = 0;
icculus@2049
   570
    int tried_to_init = 0;
slouken@0
   571
icculus@2049
   572
    if (SDL_WasInit(SDL_INIT_AUDIO)) {
slouken@2060
   573
        SDL_AudioQuit();        /* shutdown driver if already running. */
slouken@1895
   574
    }
slouken@0
   575
slouken@2060
   576
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
   577
    SDL_memset(open_devices, '\0', sizeof(open_devices));
icculus@2049
   578
slouken@1895
   579
    /* Select the proper audio driver */
slouken@1909
   580
    if (driver_name == NULL) {
slouken@1909
   581
        driver_name = SDL_getenv("SDL_AUDIODRIVER");
slouken@1909
   582
    }
icculus@2049
   583
icculus@2049
   584
    for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
icculus@2049
   585
        /* make sure we should even try this driver before doing so... */
icculus@2049
   586
        const AudioBootStrap *backend = bootstrap[i];
slouken@6900
   587
        if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
slouken@6900
   588
            (!driver_name && backend->demand_only)) {
icculus@2049
   589
            continue;
icculus@2049
   590
        }
slouken@0
   591
icculus@2049
   592
        tried_to_init = 1;
slouken@2060
   593
        SDL_memset(&current_audio, 0, sizeof(current_audio));
icculus@2049
   594
        current_audio.name = backend->name;
icculus@2049
   595
        current_audio.desc = backend->desc;
icculus@3699
   596
        initialized = backend->init(&current_audio.impl);
slouken@1895
   597
    }
icculus@2049
   598
icculus@2049
   599
    if (!initialized) {
icculus@2049
   600
        /* specific drivers will set the error message if they fail... */
icculus@2049
   601
        if (!tried_to_init) {
slouken@1895
   602
            if (driver_name) {
icculus@3699
   603
                SDL_SetError("Audio target '%s' not available", driver_name);
slouken@1895
   604
            } else {
slouken@1895
   605
                SDL_SetError("No available audio device");
slouken@1895
   606
            }
slouken@1895
   607
        }
icculus@2049
   608
slouken@2060
   609
        SDL_memset(&current_audio, 0, sizeof(current_audio));
slouken@2060
   610
        return (-1);            /* No driver was available, so fail. */
slouken@1895
   611
    }
icculus@2049
   612
icculus@2049
   613
    finalize_audio_entry_points();
icculus@2049
   614
slouken@1895
   615
    return (0);
slouken@0
   616
}
slouken@0
   617
slouken@1895
   618
/*
slouken@1895
   619
 * Get the current audio driver name
slouken@1895
   620
 */
slouken@1895
   621
const char *
slouken@1895
   622
SDL_GetCurrentAudioDriver()
slouken@0
   623
{
icculus@2049
   624
    return current_audio.name;
slouken@0
   625
}
slouken@0
   626
icculus@5593
   627
static void
icculus@5593
   628
free_device_list(char ***devices, int *devCount)
icculus@5593
   629
{
icculus@5593
   630
    int i = *devCount;
icculus@5593
   631
    if ((i > 0) && (*devices != NULL)) {
icculus@5593
   632
        while (i--) {
icculus@5593
   633
            SDL_free((*devices)[i]);
icculus@5593
   634
        }
icculus@5593
   635
    }
icculus@5593
   636
icculus@5593
   637
    if (*devices != NULL) {
icculus@5593
   638
        SDL_free(*devices);
icculus@5593
   639
    }
icculus@5593
   640
icculus@5593
   641
    *devices = NULL;
icculus@5593
   642
    *devCount = 0;
icculus@5593
   643
}
icculus@5593
   644
icculus@5593
   645
static
icculus@5593
   646
void SDL_AddCaptureAudioDevice(const char *_name)
icculus@5593
   647
{
icculus@5593
   648
    char *name = NULL;
icculus@5593
   649
    void *ptr = SDL_realloc(current_audio.inputDevices,
icculus@5593
   650
                          (current_audio.inputDeviceCount+1) * sizeof(char*));
icculus@5593
   651
    if (ptr == NULL) {
icculus@5593
   652
        return;  /* oh well. */
icculus@5593
   653
    }
icculus@5593
   654
icculus@5593
   655
    current_audio.inputDevices = (char **) ptr;
icculus@5593
   656
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   657
    current_audio.inputDevices[current_audio.inputDeviceCount++] = name;
icculus@5593
   658
}
icculus@5593
   659
icculus@5593
   660
static
icculus@5593
   661
void SDL_AddOutputAudioDevice(const char *_name)
icculus@5593
   662
{
icculus@5593
   663
    char *name = NULL;
icculus@5593
   664
    void *ptr = SDL_realloc(current_audio.outputDevices,
icculus@5593
   665
                          (current_audio.outputDeviceCount+1) * sizeof(char*));
icculus@5593
   666
    if (ptr == NULL) {
icculus@5593
   667
        return;  /* oh well. */
icculus@5593
   668
    }
icculus@5593
   669
icculus@5593
   670
    current_audio.outputDevices = (char **) ptr;
icculus@5593
   671
    name = SDL_strdup(_name);  /* if this returns NULL, that's okay. */
icculus@5593
   672
    current_audio.outputDevices[current_audio.outputDeviceCount++] = name;
icculus@5593
   673
}
icculus@5593
   674
icculus@2049
   675
slouken@1895
   676
int
icculus@2049
   677
SDL_GetNumAudioDevices(int iscapture)
slouken@0
   678
{
icculus@5593
   679
    int retval = 0;
icculus@5593
   680
icculus@2049
   681
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   682
        return -1;
icculus@2049
   683
    }
icculus@5593
   684
icculus@2049
   685
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   686
        return 0;
icculus@2049
   687
    }
icculus@2049
   688
icculus@2049
   689
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   690
        return 1;
icculus@2049
   691
    }
icculus@2049
   692
icculus@2049
   693
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   694
        return 1;
icculus@2049
   695
    }
icculus@2049
   696
icculus@5593
   697
    if (iscapture) {
icculus@5593
   698
        free_device_list(&current_audio.inputDevices,
icculus@5593
   699
                         &current_audio.inputDeviceCount);
icculus@5593
   700
        current_audio.impl.DetectDevices(iscapture, SDL_AddCaptureAudioDevice);
icculus@5593
   701
        retval = current_audio.inputDeviceCount;
icculus@5593
   702
    } else {
icculus@5593
   703
        free_device_list(&current_audio.outputDevices,
icculus@5593
   704
                         &current_audio.outputDeviceCount);
icculus@5593
   705
        current_audio.impl.DetectDevices(iscapture, SDL_AddOutputAudioDevice);
icculus@5593
   706
        retval = current_audio.outputDeviceCount;
icculus@5593
   707
    }
icculus@5593
   708
icculus@5593
   709
    return retval;
icculus@2049
   710
}
icculus@2049
   711
slouken@0
   712
icculus@2049
   713
const char *
icculus@2049
   714
SDL_GetAudioDeviceName(int index, int iscapture)
icculus@2049
   715
{
icculus@2049
   716
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   717
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   718
        return NULL;
icculus@2049
   719
    }
icculus@2049
   720
icculus@2049
   721
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   722
        SDL_SetError("No capture support");
icculus@2049
   723
        return NULL;
slouken@1895
   724
    }
icculus@2049
   725
icculus@2049
   726
    if (index < 0) {
icculus@5593
   727
        goto no_such_device;
icculus@2049
   728
    }
slouken@0
   729
icculus@2049
   730
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   731
        return DEFAULT_INPUT_DEVNAME;
icculus@2049
   732
    }
icculus@2049
   733
icculus@2049
   734
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   735
        return DEFAULT_OUTPUT_DEVNAME;
slouken@1895
   736
    }
slouken@262
   737
icculus@5593
   738
    if (iscapture) {
icculus@5593
   739
        if (index >= current_audio.inputDeviceCount) {
icculus@5593
   740
            goto no_such_device;
icculus@5593
   741
        }
icculus@5593
   742
        return current_audio.inputDevices[index];
icculus@5593
   743
    } else {
icculus@5593
   744
        if (index >= current_audio.outputDeviceCount) {
icculus@5593
   745
            goto no_such_device;
icculus@5593
   746
        }
icculus@5593
   747
        return current_audio.outputDevices[index];
icculus@5593
   748
    }
icculus@5593
   749
icculus@5593
   750
no_such_device:
icculus@5593
   751
    SDL_SetError("No such device");
icculus@5593
   752
    return NULL;
icculus@2049
   753
}
icculus@2049
   754
icculus@2049
   755
icculus@2049
   756
static void
slouken@2060
   757
close_audio_device(SDL_AudioDevice * device)
icculus@2049
   758
{
icculus@2049
   759
    device->enabled = 0;
icculus@2049
   760
    if (device->thread != NULL) {
icculus@2049
   761
        SDL_WaitThread(device->thread, NULL);
icculus@2049
   762
    }
icculus@2049
   763
    if (device->mixer_lock != NULL) {
icculus@2049
   764
        SDL_DestroyMutex(device->mixer_lock);
icculus@2049
   765
    }
icculus@2049
   766
    if (device->fake_stream != NULL) {
icculus@2049
   767
        SDL_FreeAudioMem(device->fake_stream);
icculus@2049
   768
    }
icculus@2049
   769
    if (device->convert.needed) {
icculus@2049
   770
        SDL_FreeAudioMem(device->convert.buf);
icculus@2049
   771
    }
icculus@2049
   772
    if (device->opened) {
icculus@2049
   773
        current_audio.impl.CloseDevice(device);
icculus@2049
   774
        device->opened = 0;
icculus@2049
   775
    }
icculus@2049
   776
    SDL_FreeAudioMem(device);
icculus@2049
   777
}
icculus@2049
   778
icculus@2049
   779
icculus@2049
   780
/*
icculus@2049
   781
 * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
icculus@2049
   782
 *  Fills in a sanitized copy in (prepared).
icculus@2049
   783
 *  Returns non-zero if okay, zero on fatal parameters in (orig).
icculus@2049
   784
 */
icculus@2049
   785
static int
slouken@2060
   786
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
icculus@2049
   787
{
slouken@2060
   788
    SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
icculus@2049
   789
icculus@2049
   790
    if (orig->callback == NULL) {
icculus@2049
   791
        SDL_SetError("SDL_OpenAudio() passed a NULL callback");
icculus@2049
   792
        return 0;
icculus@2049
   793
    }
icculus@2049
   794
icculus@2049
   795
    if (orig->freq == 0) {
icculus@2049
   796
        const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
slouken@2060
   797
        if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
slouken@2060
   798
            prepared->freq = 22050;     /* a reasonable default */
slouken@1895
   799
        }
slouken@1895
   800
    }
icculus@2049
   801
icculus@2049
   802
    if (orig->format == 0) {
icculus@2049
   803
        const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
icculus@2049
   804
        if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
slouken@2060
   805
            prepared->format = AUDIO_S16;       /* a reasonable default */
slouken@1895
   806
        }
slouken@1895
   807
    }
icculus@2049
   808
icculus@2049
   809
    switch (orig->channels) {
slouken@2060
   810
    case 0:{
slouken@2060
   811
            const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
slouken@2141
   812
            if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
slouken@2060
   813
                prepared->channels = 2; /* a reasonable default */
slouken@2060
   814
            }
slouken@2060
   815
            break;
icculus@2049
   816
        }
slouken@1895
   817
    case 1:                    /* Mono */
slouken@1895
   818
    case 2:                    /* Stereo */
slouken@1895
   819
    case 4:                    /* surround */
slouken@1895
   820
    case 6:                    /* surround with center and lfe */
slouken@1895
   821
        break;
slouken@1895
   822
    default:
icculus@2049
   823
        SDL_SetError("Unsupported number of audio channels.");
icculus@2049
   824
        return 0;
slouken@1895
   825
    }
icculus@2049
   826
icculus@2049
   827
    if (orig->samples == 0) {
icculus@2049
   828
        const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
slouken@2060
   829
        if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
icculus@2049
   830
            /* Pick a default of ~46 ms at desired frequency */
icculus@2049
   831
            /* !!! FIXME: remove this when the non-Po2 resampling is in. */
icculus@2049
   832
            const int samples = (prepared->freq / 1000) * 46;
icculus@2049
   833
            int power2 = 1;
icculus@2049
   834
            while (power2 < samples) {
icculus@2049
   835
                power2 *= 2;
icculus@2049
   836
            }
icculus@2049
   837
            prepared->samples = power2;
slouken@1895
   838
        }
slouken@1895
   839
    }
slouken@0
   840
slouken@1895
   841
    /* Calculate the silence and size of the audio specification */
icculus@2049
   842
    SDL_CalculateAudioSpec(prepared);
slouken@21
   843
icculus@2049
   844
    return 1;
icculus@2049
   845
}
slouken@1408
   846
slouken@21
   847
icculus@2049
   848
static SDL_AudioDeviceID
icculus@2049
   849
open_audio_device(const char *devname, int iscapture,
slouken@2866
   850
                  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
   851
                  int allowed_changes, int min_id)
icculus@2049
   852
{
icculus@2049
   853
    SDL_AudioDeviceID id = 0;
slouken@2866
   854
    SDL_AudioSpec _obtained;
icculus@2049
   855
    SDL_AudioDevice *device;
slouken@2866
   856
    SDL_bool build_cvt;
icculus@2049
   857
    int i = 0;
slouken@21
   858
icculus@2049
   859
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
   860
        SDL_SetError("Audio subsystem is not initialized");
icculus@2049
   861
        return 0;
icculus@2049
   862
    }
icculus@2049
   863
icculus@2049
   864
    if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
icculus@2049
   865
        SDL_SetError("No capture support");
icculus@2049
   866
        return 0;
icculus@2049
   867
    }
icculus@2049
   868
slouken@2866
   869
    if (!obtained) {
slouken@2866
   870
        obtained = &_obtained;
slouken@2866
   871
    }
slouken@2866
   872
    if (!prepare_audiospec(desired, obtained)) {
icculus@2049
   873
        return 0;
icculus@2049
   874
    }
icculus@2049
   875
icculus@2049
   876
    /* If app doesn't care about a specific device, let the user override. */
icculus@2049
   877
    if (devname == NULL) {
icculus@2049
   878
        devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
slouken@1895
   879
    }
slouken@21
   880
icculus@2049
   881
    /*
icculus@2049
   882
     * Catch device names at the high level for the simple case...
icculus@2049
   883
     * This lets us have a basic "device enumeration" for systems that
icculus@2049
   884
     *  don't have multiple devices, but makes sure the device name is
icculus@2049
   885
     *  always NULL when it hits the low level.
icculus@2049
   886
     *
icculus@2049
   887
     * Also make sure that the simple case prevents multiple simultaneous
icculus@2049
   888
     *  opens of the default system device.
icculus@2049
   889
     */
icculus@2049
   890
icculus@2049
   891
    if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
icculus@2049
   892
        if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
icculus@2049
   893
            SDL_SetError("No such device");
icculus@2049
   894
            return 0;
icculus@2049
   895
        }
icculus@2049
   896
        devname = NULL;
icculus@2049
   897
icculus@2049
   898
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   899
            if ((open_devices[i]) && (open_devices[i]->iscapture)) {
icculus@2049
   900
                SDL_SetError("Audio device already open");
icculus@2049
   901
                return 0;
icculus@2049
   902
            }
icculus@2049
   903
        }
icculus@2049
   904
    }
icculus@2049
   905
icculus@2049
   906
    if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
icculus@2049
   907
        if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
icculus@2049
   908
            SDL_SetError("No such device");
icculus@2049
   909
            return 0;
icculus@2049
   910
        }
icculus@2049
   911
        devname = NULL;
icculus@2049
   912
icculus@2049
   913
        for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@2049
   914
            if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
icculus@2049
   915
                SDL_SetError("Audio device already open");
icculus@2049
   916
                return 0;
icculus@2049
   917
            }
icculus@2049
   918
        }
icculus@2049
   919
    }
icculus@2049
   920
slouken@2060
   921
    device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
icculus@2049
   922
    if (device == NULL) {
icculus@2049
   923
        SDL_OutOfMemory();
icculus@2049
   924
        return 0;
icculus@2049
   925
    }
slouken@2060
   926
    SDL_memset(device, '\0', sizeof(SDL_AudioDevice));
slouken@2866
   927
    device->spec = *obtained;
icculus@2049
   928
    device->enabled = 1;
icculus@2049
   929
    device->paused = 1;
icculus@2049
   930
    device->iscapture = iscapture;
icculus@2049
   931
icculus@2049
   932
    /* Create a semaphore for locking the sound buffers */
icculus@2049
   933
    if (!current_audio.impl.SkipMixerLock) {
icculus@2049
   934
        device->mixer_lock = SDL_CreateMutex();
icculus@2049
   935
        if (device->mixer_lock == NULL) {
icculus@2049
   936
            close_audio_device(device);
icculus@2049
   937
            SDL_SetError("Couldn't create mixer lock");
icculus@2049
   938
            return 0;
icculus@2049
   939
        }
icculus@2049
   940
    }
icculus@2049
   941
icculus@5593
   942
    /* force a device detection if we haven't done one yet. */
icculus@5593
   943
    if ( ((iscapture) && (current_audio.inputDevices == NULL)) ||
icculus@5593
   944
         ((!iscapture) && (current_audio.outputDevices == NULL)) )
icculus@5593
   945
        SDL_GetNumAudioDevices(iscapture);
icculus@5593
   946
icculus@7038
   947
    if (current_audio.impl.OpenDevice(device, devname, iscapture) < 0) {
icculus@2049
   948
        close_audio_device(device);
icculus@2049
   949
        return 0;
icculus@2049
   950
    }
icculus@2049
   951
    device->opened = 1;
slouken@0
   952
slouken@1895
   953
    /* Allocate a fake audio memory buffer */
aschiffler@4865
   954
    device->fake_stream = (Uint8 *)SDL_AllocAudioMem(device->spec.size);
icculus@2049
   955
    if (device->fake_stream == NULL) {
icculus@2049
   956
        close_audio_device(device);
slouken@1895
   957
        SDL_OutOfMemory();
icculus@2049
   958
        return 0;
slouken@1895
   959
    }
slouken@0
   960
slouken@2866
   961
    /* If the audio driver changes the buffer size, accept it */
slouken@2866
   962
    if (device->spec.samples != obtained->samples) {
slouken@2866
   963
        obtained->samples = device->spec.samples;
slouken@2866
   964
        SDL_CalculateAudioSpec(obtained);
slouken@2866
   965
    }
slouken@2866
   966
slouken@1895
   967
    /* See if we need to do any conversion */
slouken@2866
   968
    build_cvt = SDL_FALSE;
slouken@2866
   969
    if (obtained->freq != device->spec.freq) {
slouken@2866
   970
        if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
slouken@2866
   971
            obtained->freq = device->spec.freq;
slouken@2866
   972
        } else {
slouken@2866
   973
            build_cvt = SDL_TRUE;
slouken@2866
   974
        }
slouken@2866
   975
    }
slouken@2866
   976
    if (obtained->format != device->spec.format) {
slouken@2866
   977
        if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
slouken@2866
   978
            obtained->format = device->spec.format;
slouken@2866
   979
        } else {
slouken@2866
   980
            build_cvt = SDL_TRUE;
slouken@2866
   981
        }
slouken@2866
   982
    }
slouken@2866
   983
    if (obtained->channels != device->spec.channels) {
slouken@2866
   984
        if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
slouken@2866
   985
            obtained->channels = device->spec.channels;
slouken@2866
   986
        } else {
slouken@2866
   987
            build_cvt = SDL_TRUE;
slouken@2866
   988
        }
slouken@2866
   989
    }
slouken@2866
   990
    if (build_cvt) {
slouken@1895
   991
        /* Build an audio conversion block */
icculus@2049
   992
        if (SDL_BuildAudioCVT(&device->convert,
slouken@2866
   993
                              obtained->format, obtained->channels,
slouken@2866
   994
                              obtained->freq,
icculus@2049
   995
                              device->spec.format, device->spec.channels,
icculus@2049
   996
                              device->spec.freq) < 0) {
icculus@2049
   997
            close_audio_device(device);
icculus@2049
   998
            return 0;
slouken@1895
   999
        }
icculus@2049
  1000
        if (device->convert.needed) {
slouken@2866
  1001
            device->convert.len = (int) (((double) obtained->size) /
slouken@2060
  1002
                                         device->convert.len_ratio);
icculus@2053
  1003
icculus@2049
  1004
            device->convert.buf =
icculus@2049
  1005
                (Uint8 *) SDL_AllocAudioMem(device->convert.len *
icculus@2049
  1006
                                            device->convert.len_mult);
icculus@2049
  1007
            if (device->convert.buf == NULL) {
icculus@2049
  1008
                close_audio_device(device);
slouken@1895
  1009
                SDL_OutOfMemory();
icculus@2049
  1010
                return 0;
slouken@1895
  1011
            }
slouken@1895
  1012
        }
slouken@1895
  1013
    }
icculus@2049
  1014
icculus@2049
  1015
    /* Find an available device ID and store the structure... */
slouken@2060
  1016
    for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
icculus@2049
  1017
        if (open_devices[id] == NULL) {
icculus@2049
  1018
            open_devices[id] = device;
icculus@2049
  1019
            break;
icculus@2049
  1020
        }
icculus@2049
  1021
    }
icculus@2049
  1022
icculus@2049
  1023
    if (id == SDL_arraysize(open_devices)) {
icculus@2049
  1024
        SDL_SetError("Too many open audio devices");
icculus@2049
  1025
        close_audio_device(device);
icculus@2049
  1026
        return 0;
icculus@2049
  1027
    }
icculus@2049
  1028
slouken@1895
  1029
    /* Start the audio thread if necessary */
icculus@2049
  1030
    if (!current_audio.impl.ProvidesOwnCallbackThread) {
slouken@1895
  1031
        /* Start the audio thread */
icculus@5969
  1032
        char name[64];
icculus@5969
  1033
        SDL_snprintf(name, sizeof (name), "SDLAudioDev%d", (int) (id + 1));
icculus@2049
  1034
/* !!! FIXME: this is nasty. */
icculus@6430
  1035
#if defined(__WIN32__) && !defined(HAVE_LIBC)
slouken@1330
  1036
#undef SDL_CreateThread
icculus@5969
  1037
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device, NULL, NULL);
slouken@1330
  1038
#else
icculus@5969
  1039
        device->thread = SDL_CreateThread(SDL_RunAudio, name, device);
slouken@1330
  1040
#endif
icculus@2049
  1041
        if (device->thread == NULL) {
slouken@2060
  1042
            SDL_CloseAudioDevice(id + 1);
slouken@1895
  1043
            SDL_SetError("Couldn't create audio thread");
icculus@2049
  1044
            return 0;
icculus@2049
  1045
        }
icculus@2049
  1046
    }
icculus@2049
  1047
slouken@2060
  1048
    return id + 1;
icculus@2049
  1049
}
icculus@2049
  1050
icculus@2049
  1051
icculus@2049
  1052
int
slouken@2866
  1053
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
icculus@2049
  1054
{
icculus@2049
  1055
    SDL_AudioDeviceID id = 0;
icculus@2049
  1056
icculus@2049
  1057
    /* Start up the audio driver, if necessary. This is legacy behaviour! */
icculus@2049
  1058
    if (!SDL_WasInit(SDL_INIT_AUDIO)) {
icculus@2049
  1059
        if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
slouken@1895
  1060
            return (-1);
slouken@1895
  1061
        }
icculus@2049
  1062
    }
slouken@0
  1063
icculus@2049
  1064
    /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
icculus@2049
  1065
    if (open_devices[0] != NULL) {
icculus@2049
  1066
        SDL_SetError("Audio device is already opened");
icculus@2049
  1067
        return (-1);
slouken@1895
  1068
    }
icculus@2049
  1069
slouken@2866
  1070
    if (obtained) {
slouken@2866
  1071
        id = open_audio_device(NULL, 0, desired, obtained,
slouken@2866
  1072
                               SDL_AUDIO_ALLOW_ANY_CHANGE, 1);
slouken@2866
  1073
    } else {
slouken@2866
  1074
        id = open_audio_device(NULL, 0, desired, desired, 0, 1);
slouken@2866
  1075
    }
slouken@21
  1076
icculus@5964
  1077
    SDL_assert((id == 0) || (id == 1));
icculus@2049
  1078
    return ((id == 0) ? -1 : 0);
icculus@2049
  1079
}
slouken@21
  1080
icculus@2049
  1081
SDL_AudioDeviceID
icculus@2049
  1082
SDL_OpenAudioDevice(const char *device, int iscapture,
slouken@2866
  1083
                    const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
slouken@2866
  1084
                    int allowed_changes)
icculus@2049
  1085
{
slouken@2866
  1086
    return open_audio_device(device, iscapture, desired, obtained,
slouken@2866
  1087
                             allowed_changes, 2);
slouken@1895
  1088
}
slouken@1895
  1089
slouken@3537
  1090
SDL_AudioStatus
icculus@2049
  1091
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
slouken@1895
  1092
{
icculus@2049
  1093
    SDL_AudioDevice *device = get_audio_device(devid);
slouken@3537
  1094
    SDL_AudioStatus status = SDL_AUDIO_STOPPED;
icculus@2049
  1095
    if (device && device->enabled) {
icculus@2049
  1096
        if (device->paused) {
slouken@1895
  1097
            status = SDL_AUDIO_PAUSED;
slouken@1895
  1098
        } else {
slouken@1895
  1099
            status = SDL_AUDIO_PLAYING;
slouken@1895
  1100
        }
slouken@1895
  1101
    }
slouken@1895
  1102
    return (status);
slouken@0
  1103
}
slouken@0
  1104
icculus@2049
  1105
slouken@3537
  1106
SDL_AudioStatus
icculus@2049
  1107
SDL_GetAudioStatus(void)
icculus@2049
  1108
{
icculus@2049
  1109
    return SDL_GetAudioDeviceStatus(1);
icculus@2049
  1110
}
icculus@2049
  1111
icculus@2049
  1112
void
icculus@2049
  1113
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
icculus@2049
  1114
{
icculus@2049
  1115
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1116
    if (device) {
icculus@2049
  1117
        device->paused = pause_on;
icculus@2049
  1118
    }
icculus@2049
  1119
}
icculus@2049
  1120
slouken@1895
  1121
void
slouken@1895
  1122
SDL_PauseAudio(int pause_on)
slouken@0
  1123
{
icculus@2049
  1124
    SDL_PauseAudioDevice(1, pause_on);
icculus@2049
  1125
}
icculus@2049
  1126
slouken@0
  1127
icculus@2049
  1128
void
icculus@2049
  1129
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1130
{
icculus@2049
  1131
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1132
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1133
    if (device) {
icculus@2049
  1134
        current_audio.impl.LockDevice(device);
slouken@1895
  1135
    }
slouken@0
  1136
}
slouken@0
  1137
slouken@1895
  1138
void
slouken@1895
  1139
SDL_LockAudio(void)
slouken@0
  1140
{
icculus@2049
  1141
    SDL_LockAudioDevice(1);
icculus@2049
  1142
}
slouken@0
  1143
icculus@2049
  1144
void
icculus@2049
  1145
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1146
{
slouken@1895
  1147
    /* Obtain a lock on the mixing buffers */
icculus@2049
  1148
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1149
    if (device) {
icculus@2049
  1150
        current_audio.impl.UnlockDevice(device);
slouken@1895
  1151
    }
slouken@0
  1152
}
slouken@0
  1153
slouken@1895
  1154
void
slouken@1895
  1155
SDL_UnlockAudio(void)
slouken@0
  1156
{
icculus@2049
  1157
    SDL_UnlockAudioDevice(1);
icculus@2049
  1158
}
slouken@0
  1159
icculus@2049
  1160
void
icculus@2049
  1161
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
icculus@2049
  1162
{
icculus@2049
  1163
    SDL_AudioDevice *device = get_audio_device(devid);
icculus@2049
  1164
    if (device) {
icculus@2049
  1165
        close_audio_device(device);
slouken@2060
  1166
        open_devices[devid - 1] = NULL;
slouken@1895
  1167
    }
slouken@0
  1168
}
slouken@0
  1169
slouken@1895
  1170
void
slouken@1895
  1171
SDL_CloseAudio(void)
slouken@0
  1172
{
icculus@2049
  1173
    SDL_CloseAudioDevice(1);
slouken@0
  1174
}
slouken@0
  1175
slouken@1895
  1176
void
slouken@1895
  1177
SDL_AudioQuit(void)
slouken@0
  1178
{
icculus@7348
  1179
    SDL_AudioDeviceID i;
icculus@7348
  1180
icculus@7345
  1181
    if (!current_audio.name) {  /* not initialized?! */
icculus@7345
  1182
        return;
icculus@7345
  1183
    }
icculus@7345
  1184
icculus@2049
  1185
    for (i = 0; i < SDL_arraysize(open_devices); i++) {
icculus@7342
  1186
        if (open_devices[i] != NULL) {
icculus@7342
  1187
            SDL_CloseAudioDevice(i);
icculus@7342
  1188
        }
icculus@2049
  1189
    }
slouken@0
  1190
icculus@2049
  1191
    /* Free the driver data */
icculus@2049
  1192
    current_audio.impl.Deinitialize();
icculus@5593
  1193
    free_device_list(&current_audio.outputDevices,
icculus@5593
  1194
                     &current_audio.outputDeviceCount);
icculus@5593
  1195
    free_device_list(&current_audio.inputDevices,
icculus@5593
  1196
                     &current_audio.inputDeviceCount);
slouken@2060
  1197
    SDL_memset(&current_audio, '\0', sizeof(current_audio));
slouken@2060
  1198
    SDL_memset(open_devices, '\0', sizeof(open_devices));
slouken@0
  1199
}
slouken@0
  1200
icculus@1982
  1201
#define NUM_FORMATS 10
slouken@0
  1202
static int format_idx;
slouken@0
  1203
static int format_idx_sub;
icculus@1982
  1204
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
slouken@1895
  1205
    {AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1206
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
slouken@1895
  1207
    {AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
icculus@1982
  1208
     AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
icculus@1982
  1209
    {AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
icculus@1982
  1210
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1211
    {AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
icculus@1982
  1212
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1213
    {AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
icculus@1982
  1214
     AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
icculus@1982
  1215
    {AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
icculus@1982
  1216
     AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1217
    {AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
icculus@1993
  1218
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1219
    {AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
icculus@1993
  1220
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1221
    {AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
icculus@1993
  1222
     AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
icculus@1993
  1223
    {AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
icculus@1993
  1224
     AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
slouken@0
  1225
};
slouken@0
  1226
icculus@1982
  1227
SDL_AudioFormat
icculus@1982
  1228
SDL_FirstAudioFormat(SDL_AudioFormat format)
slouken@0
  1229
{
slouken@1895
  1230
    for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
slouken@1895
  1231
        if (format_list[format_idx][0] == format) {
slouken@1895
  1232
            break;
slouken@1895
  1233
        }
slouken@1895
  1234
    }
slouken@1895
  1235
    format_idx_sub = 0;
slouken@1895
  1236
    return (SDL_NextAudioFormat());
slouken@0
  1237
}
slouken@0
  1238
icculus@1982
  1239
SDL_AudioFormat
slouken@1895
  1240
SDL_NextAudioFormat(void)
slouken@0
  1241
{
slouken@1895
  1242
    if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
slouken@1895
  1243
        return (0);
slouken@1895
  1244
    }
slouken@1895
  1245
    return (format_list[format_idx][format_idx_sub++]);
slouken@0
  1246
}
slouken@0
  1247
slouken@1895
  1248
void
slouken@1895
  1249
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
slouken@0
  1250
{
slouken@1895
  1251
    switch (spec->format) {
slouken@1895
  1252
    case AUDIO_U8:
slouken@1895
  1253
        spec->silence = 0x80;
slouken@1895
  1254
        break;
slouken@1895
  1255
    default:
slouken@1895
  1256
        spec->silence = 0x00;
slouken@1895
  1257
        break;
slouken@1895
  1258
    }
icculus@2049
  1259
    spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
slouken@1895
  1260
    spec->size *= spec->channels;
slouken@1895
  1261
    spec->size *= spec->samples;
slouken@0
  1262
}
slouken@1895
  1263
icculus@2049
  1264
icculus@2049
  1265
/*
icculus@2049
  1266
 * Moved here from SDL_mixer.c, since it relies on internals of an opened
icculus@2049
  1267
 *  audio device (and is deprecated, by the way!).
icculus@2049
  1268
 */
icculus@2049
  1269
void
icculus@2049
  1270
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
icculus@2049
  1271
{
icculus@2049
  1272
    /* Mix the user-level audio format */
icculus@2049
  1273
    SDL_AudioDevice *device = get_audio_device(1);
icculus@2049
  1274
    if (device != NULL) {
icculus@2049
  1275
        SDL_AudioFormat format;
icculus@2049
  1276
        if (device->convert.needed) {
icculus@2049
  1277
            format = device->convert.src_format;
icculus@2049
  1278
        } else {
icculus@2049
  1279
            format = device->spec.format;
icculus@2049
  1280
        }
icculus@2049
  1281
        SDL_MixAudioFormat(dst, src, format, len, volume);
icculus@2049
  1282
    }
icculus@2049
  1283
}
icculus@2049
  1284
slouken@1895
  1285
/* vi: set ts=4 sw=4 expandtab: */